Practical R-Q and D-Q Models for Video Rate Control

Jae Cheol KWON  Myeong-jin LEE  Jae-kyoon KIM  

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.4    pp.1476-1480
Publication Date: 2003/04/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Multimedia Systems
R-D model,  R-Q model,  D-Q model,  

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Practical and accurate R-Q (rate-quantization) and D-Q (distortion-quantization) models are presented to describe the R-D (rate-distortion) relationship before encoding a frame. The R-Q model is based on a linear relationship between non-zero level count of the DCT coefficients and the generated bits, while the D-Q model comes from the observation that the ratio QP2/D(QP) can be very accurately approximated by a quadratic function of QP, where QP is the quantization parameter used for quantization of DCT coefficients in H. 263 video coding standard. Simulation results show that the proposed models estimate the real coding results very accurately.